Electrical coil



Aug. 3 1926.

c. a. THORDARSON ELECTRICAL CO IL Original Filed Oct. 27. 1920 Patented Aug, 3,, 1926.

UNITED STATES CHESTER H. THOBDABBON, OF CHICAGO, ILLINOIS.

ELECTRICAL COIL.

Original application tiled October 27,- 1920, Serial No. 420,049. Divided and this application fled January as, 1924.

This invention relates toa novel coil or WlIldlIlg for electrical devices such as transformers and thelike, and particularly toa polysided coil, eithersquare or oblong, pre-' l senting exterior angles between their fiat sides.

The invention refers more particularlyto a coil which is so constructed that the parts of each turn of the coil' or windin which 'lie in the straight parts of the coil etween exterior angles are preformed to give ascraped off the turns. The construction also results in a very compact winding in which a large number of turns can be wound ina small space, thus reducing the dimensions of the coil or winding as a whole and improving the electro-magnetic function of the coil or winding.-

I have shown 1n the drawings one embodiment of the invention, wherein the conduc tors of the. coil are assumed to be insulated by an enamel coating, and have also illustrated in the drawin one form of mechanism by which thecoilis made, the latter'to better illustrate the construction of the coil or winding. The method of making the coil is shown and claimed in my prior Patent No.. 1,482,951 dated February. 5, 1924, of Which the present application is a division.

'As' shown in the drawings:

Figure 1 is a perspective view of a coil embodying my invention.

- sulated wire.

' Figures 2, 3, and 4 illustrate diagrammatically mechanism for winding the coil and illustrates the ,method of winding the coiluon a supporting bobbin,

The coil 10 shown in Figure *1 is vmade up of a number of turns 11 of enamel in- The dimension of'the coil may be'greatly varied, either shortened or lengthened, as compared to that-shown in Figure 1, and thewire or conductor 11 may be insulated by a fabric insulation, such as silk. The turns may be held together by means of taping bands 12 which are assem-.

bled inthe coil structure durin the winding operation. As shown in Figure 1 and the remaining figures, the gauge of the wire tion parallel-to the axis of the bobbin sup- Serial No. 688,956.

turns is considerably greater than would be indicated by the illustrated coil dimenslons, for the purpose of showing the relation of the parts of the winding turns and their relation to the winding mechanisms. It will be understood that the turns of the conductor may vary considerably? in gauge dimensions and that the coil or winding mayalso be made of any practical ,di-' mension desired.

The coil or winding is shown as formed by laying the wire or conductor on a collapsible' shell-like bobbin 13 that maybe supported on a rotative bobbin support 14 or, preferably and in practice, laid directly on an inner coil or winding support 15 made of paper board, fibre or the-like and which conlstitu'tes a unitary part of the finished co1 I e The bobbin support can be assumed to be rotated by any suitable means, such, for instance, as that illustrated in my co-pending application for United States Letters Patent S. N. 425,317, filed November 20, 1920, and the wire or conductor 11 can also be assumed to be taken from a reel on such a. machine and led to the coil or winding support 15 and forming coil about parts of the peripheries of presetting and, laying on discs 16, 17 which are supported to rotate/freely on shafts that are mounted on an arm or arms 18 which, in the machine shown in the last aforementioned application, is caused to travel in a direcport t spirally lay the turns on the inner support 15 or the forming bobbin. v

The discs 16, 17 serve to preform the wire or conductor 11 just before it t0'5 Wound upon or enters the coil, or winding structure and thus giving to the parts of the turns as they enter the coil a preset in a manner to cause them to tend towards the center of the coil or winding between the exterior angles 19 thereof, as shown in 9 Figures 1 and 2. Thus, when the turn parts are laid (in the coil or wind ng support 15 and on the forming c oi e inwardlyicurved or 'pre-set POI'CIOIIS of the turns lie fiat in the' sides of the coil or 105 after assemb ed the coil has the effect the liability of counter movement of the turn after cutting the tapes and folding parts which would have the effect of rubing or scraping the insulation from the turn parts.

The ta ing bands 12 when em loyed are assemble in the winding b app ying them between the collapsible bob in shell 13 and the winding or coil support 15 in the first part of the winding op ration, and therethem over the exterior sides of the windin or coils in end overlapped relation an cementiing the ends together, as shown in Figure A bobbin structure for this purpose is shown in Figure 4, wherein the ta to produce the ta e bands 12 are aid in recesses 21 forme in an enlarged portion 22*of the bobbin structure in planes arallel to each other and an interme 'ate lane passed through the axis of the bobin support. The parts of the tapes, during the windin operation, lie between said shell 13 and said support 15, as best shown in Figures 2, 3 and 4. When employing a bobbin of the type shown, the extremity of the innermost turn can be fastened to a screw 23 threaded into the'enlarged end of the .bobbin structure. The dotted lines indicate in Figure 4a raised partial turn oi the winding, and indicate the pre-set which has been given to the turn parts before the wire enters the coil, and which remains, in the wound coil, as a'factor to cause the turns to lie flat in the sides of the coil or winding.

I claim as my invention:

1. A polysided electric coil or windin composed of a number of spirally wound turns, the turn parts in the flat sides of the coil or winding between exterior angles thereof having a set to tend toward the center of the coil.

2. A pol ysided electric coil or windin comprising an inner insulating polysid support and a plurality of spiral y wound turn parts ap liedto said support, the turn parts in the at sides of the coil having an inward set.-

3. A polvsided electric coil or winding comprising a numberv of spirally woun turns, the turn parts in the flat sides of the coil or winding having a set to tend toward the center of the coil, and tapes enclosing the flat sides of the coil or winding between the exterior angles thereof.

In witness whereof I claim the foregoing as my invention, I hereunto append my signature this th day of January, 1924.

CHESTER H. THORDARSON. 

